Various build system clean-ups and simplifications:
- Created Makefile.tool-tests.am, put standard AM_CFLAGS et al for tests in
  it.
- A number of tests are shared between Helgrind and DRD.  They used to be
  built in both directories.  Now they are only built in helgrind/tests/,
  and the DRD .vgtest files just point to the executable in helgrind/tests/.
  Most of these (about 30) had the source files in helgrind/tests/;  I moved
  the three that were in drd/tests/ into helgrind/tests/ for consistency.
- Fixed rwlock_test, which was failing to run due to a wrong name in the
  .vgtest file.
- Removed remnants of unused 'hello' test for Memcheck.
- Avoided redundant flag specification in various places, esp.
  memcheck/tests/Makefile.am.
- Removed unnecessary _AIX guards in some Linux-only tests.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@9202 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/drd/tests/tc07_hbl1.vgtest b/drd/tests/tc07_hbl1.vgtest
index b9eba4e..b8eb639 100644
--- a/drd/tests/tc07_hbl1.vgtest
+++ b/drd/tests/tc07_hbl1.vgtest
@@ -1,2 +1,2 @@
 prereq: ./supported_libpthread
-prog: tc07_hbl1
+prog: ../../helgrind/tests/tc07_hbl1